Abstract
Effects of enviromental temperature on the failure time in stress corrosion cracking of Al-6.12wt%Zn-2.05wt% Mg alloy were investigated by the Weibull distribution method. Test pieces were solution treated at 460°C for 1h, quenched into ice-water, aged at 120°C for 24h and tested at temperatures from 13° to 53°C under a constant applied stress of 80% of the yield stress in 3.5%NaCl+0.2%H2O2 aqueous solution of pH 5.2. Both failure time and crack initiation time obey the single Weibull distribution with location parameters. The former time depends on the latter time. Their shape parameters are independent of temperatures and equal to 1.5, which corresponds to the parameter of wear out failure. Stress corrosion cracking of this alloy considerably depends on temperature. Apparent activation energies evaluated from Arrhenius plots of reciprocals of mean values are 16.4kcal/mol in failure time, 17.4kcal/mol in crack initiation time, and 13.1kcal/mol in crack propagation period.
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